Concrete Calculator
Calculate cubic metres of concrete needed for slabs, footings, and columns.
Concrete Required
📦 Bag Options
💡 Concrete Tips
- • Order 5-10% extra to account for spillage and waste
- • Pour should be completed within 90 minutes of mixing
- • Proper curing (7-28 days) critical for strength
- • Standard concrete: 150 lbs/cubic foot
- • Slabs: typical depth 4 inches (0.1 m)
- • Footings: depth below frost line + 12 inches
Formula
Slab/Footing: Volume = Length × Width × Depth
Column: Volume = π × (Diameter/2)² × Height
How it works
Slab/Footing Volume: V = Length × Width × Depth Circular Column Volume: V = π × (Diameter/2)² × Height Weight Calculation: Weight = Volume (m³) × 2400 kg/m³ Bag Calculation (50lb bags): Bags = Volume (ft³) / 0.375 Example: Slab: 10m × 10m × 0.1m = 10 m³ Weight: 10 × 2400 = 24,000 kg Bags (50lb): 353 ft³ ÷ 0.375 = 941 bags Standard Concrete Weight: 2400 kg/m³ (150 lbs/ft³)
The concrete calculator estimates the volume and weight of concrete needed for slabs, footings, and columns. Enter dimensions and project type to calculate cubic meters/feet, required bags, and total weight. Supports both metric and imperial measurements.
Why this matters
Accurate concrete estimation prevents over-ordering (wasted money) or under-ordering (project delays). Understanding weight helps plan delivery and determine equipment needs. Proper quantities ensure structural integrity.
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Learn more
The complete guide to concrete calculator
Formulas, examples, and tips explained in plain English